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car exhaust question
Posted: Wed Jan 23, 2008 6:23 pm
by CHIEF88
Hi fellas,
So I have some extractors for my 87' hilux (4y engine) that I am yet to put on, now I have just been to the wreckers and was told there'd be a complete exhaust system available for my car. When I had a look around all I could find was a 2wd lux with a 2y engine; however, it looks to me like it could fit ? anyone know or think why it might not fit? would the pipe be the same diameter? Didn't get time to measure it up at wreckers as they were closing.
As a side question when installing my extractors what happens to the stuff sitting above my exhaust manifold ? looks like its connected in some way.
(I can add pictures if needed)
p.s. wreckers are so helpful
Dean.
Posted: Wed Jan 23, 2008 9:24 pm
by want33s
A 2wd system will most likely fit but you'd have to make sure the mounts are in the same spot.
I wouldn't bother with a 2nd hand exhaust system when you can buy new for just a bit more than the wreckers would charge anyway and if you want to fit extractors you'll need the pipe modded so it all lines up.
To fit the extractors you'll have to unbolt the exhaust manifold from the inlet manifold. Not as easy as it sounds as all the bolts will be seized and rusty.
Most exhaust shops will supply and fit name brand extractors and a system for a 4 cyl ute for around $7-800
Posted: Wed Jan 23, 2008 9:51 pm
by CHIEF88
Wreckers said 75 bucks from engine back and extractors were 50 so was trying to do very cheaply, I was going to get the exhaust shop to weld together and move mounts to fit (if they could otherwise do myself).
Do you think the bolts will break or just be annoying ?
Any idea if that stuff I was talking about above my exhaust manifold will have to be removed?
When I find myself doing the lining up and moving mounts I should be able to use flexy exhaust pipe shouldn't I to match the extractors to the rest?
And new exhaust system would include a new Cat and they arnt that cheap. Especially for my wage.
Posted: Wed Jan 23, 2008 10:09 pm
by Sic Lux
Put up a pic of the "stuff" above your exhaust manifold it may just be a part of the heat sheild or part of the emission control
i don't think the 4y's came with a cat so there's no need to put one on. Mates sytstem on his ln106 cost him about 300-400. make sure you get a flexi joint put in othwerwise it'll crack the extractors over time mines done it twice on me so i put one in.
Posted: Wed Jan 23, 2008 10:20 pm
by CHIEF88
My car definitely has a Cat convertor on it at the moment so I hope it was meant to come with one
The Picture shows the 'stuff' I mean. Someone can explain to me if I have got it wrong .. The really rusted bit is the exhaust manifold which will be replaced by extractors? and the thing above it is for emissions ? are they connected?
Posted: Wed Jan 23, 2008 10:37 pm
by Sic Lux
The tin rusty bit is a heat sheild the other rusty bit below it is the exhaust manifold which is replaced by the extractors and the heat sheild would go in the bin with the old exhaust manifold. If you do fit them yourself make sure if you pull any of them small hoses off mark them they can be a real PITFA when it comes to putting them back on.
Posted: Wed Jan 23, 2008 10:47 pm
by CHIEF88
so theres no actual connection between the manifold and heat shield and the thing with lots of little hoses attached ? What is in those little hoses ? fuel ? by disconnecting them will I muck anything else up like am I right to take that all out or are some bits under pressure ?
sorry for being so noob haha but I'm trying to learn at least.
Posted: Wed Jan 23, 2008 10:59 pm
by CHIEF88
ok A is the exhaust manifold and heat shield.
B ? what is B?
C ? what is C?
If my extractors replace the manifold and heat shield will the extractors fit beneath B or what?
Posted: Thu Jan 24, 2008 1:56 pm
by want33s
A is the exhaust manifold.
B is the inlet manifold.
C is the carby.
The exhaust manifold is bolted to the inlet manifild with four bolts...one of which can just be seen to the right of your letter 'B' . Vertical not horizontal. They are bolted together to heat the inlet manifold which helps with cold starts and aids in fuel atomisation/economy.
Mark all hoses clearly with something that won't rub off before you pull anything apart.
$125 for extractors and pipe isn't too bad, if it fits.
I wouldn't use flexy pipe to join.
Get a bracket welded to the pipe and bolt it to the back of the gearbox or transfer so the whole pipe rocks with the engine.
The exhasust shop should know what you mean as most cars have a similar bracket bolted to bellhousing.
Posted: Thu Jan 24, 2008 3:19 pm
by CHIEF88
Thanks thats good info. How come you advise against flexy pipe ?
I picked up the exhaust today, they had cut it pretty close to the cat ill get pictures later today. ended up being an extra 30 bucks for the cat (supposed to be 90). I think I will have to get a section of pipe to put in between my extractors and the rest.
Also if the inlet manifold is bolted to the exhaust manifold do I just not bolt it to anything when I put extractors in? I thought those bolts might be structural in a way, but sounds like their not.
Posted: Thu Jan 24, 2008 6:02 pm
by want33s
CHIEF88 wrote:Thanks thats good info. How come you advise against flexy pipe ?
Flexi pipe rusts out very quickly compared to normal pipe (and is dearer). If the system is fitted properly it won't need a flexible joint.
Usually ONLY front wheel drive cars have flexi's cause the engine rocks backwards and forwards not side to side like a real car!
I picked up the exhaust today, they had cut it pretty close to the cat ill get pictures later today. ended up being an extra 30 bucks for the cat (supposed to be 90). I think I will have to get a section of pipe to put in between my extractors and the rest.
Thats to be expected. Pipe will usually need to be bent to line up with extractors anyway.
Also if the inlet manifold is bolted to the exhaust manifold do I just not bolt it to anything when I put extractors in? I thought those bolts might be structural in a way, but sounds like their not.
Just unbolt the exhaust manifold(& heat shield) and throw away. The inlet manifold will support itself just fine from the studs in the head.
Watch out for the studs unscrewing from the head though when you try to undo the nuts. Nothing you can do to stop them if they want to unscrew but you'll need to get the nuts loose so you can use two nuts to lock together to screw the stud back in. OR replace the studs.
Posted: Thu Jan 24, 2008 9:11 pm
by Stuart McMurtrie
want33s wrote:Usually ONLY front wheel drive cars have flexi's cause the engine rocks backwards and forwards not side to side like a real car! quote]
All 80 series diesels have a flexy pipe and I would imagine they are "real" cars.
cheers
Posted: Thu Jan 24, 2008 10:14 pm
by want33s
Stuart McMurtrie wrote:want33s wrote:Usually ONLY front wheel drive cars have flexi's cause the engine rocks backwards and forwards not side to side like a real car! quote]
All 80 series diesels have a flexy pipe and I would imagine they are "real" cars.
cheers
READ ... "Usually"
I even explained why... I guess theres one in every crowd.
